Steam rock-drill



(No Model.)

J. C. GITHENS. STEAM ROGK DRILL.

No. 408,878. Patented Aug. 13, 1889.

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nm es am W7 y W e 411/ Iumvm Je e INVENTOR UNITED STATES PATENT OFFICE.

JOSEPH O. GITHENS, OF NEV YORK, N. Y., ASSIGNOR TO THE RAND DRILL COMPANY, OF NEV YORK.

STEAM aooKmmtl..

SPECIFICATION forming part of Letters Patent No. 408,878, dated August 13, 1889.

Application filed February 11, 1888. Renewed January 3l, 1889. Serial No. 298,251. (No model.)

To all 1071/0711, t may concern: responding apertures in the lugs b and b on Be it known that I, JOSEPH C. GITHENS, of the respective upper and lower heads. The the city, county, and State of New York, and guides fit the apertures, so that the drill-cylina citizen of the United States, have invented der may slidelongitudinallythereof. At their 55 5 certain new and useful Improvements in upper ends the guides C O are tied together Steam Rock-Drills, of which the following is by a yoke C', in which the feed-screw A2 is a full, clear, and exact description, reference vconveniently given a threaded bearing, as being had to the accompanying drawings, shown, and above which said feed-screw is forming part of this specification. furnished with its operating-crank c. At 6o 1o My invention relates to steam rock-drills; their lower or opposite ends the guides O C and the object of my invention is to provide are seated upon and bolted to the frame of a rock -drill in which is comprised a motormy tripod D and extend vertically upward cylinder driven by steam or air, which is easily therefrom. and conveniently portable by the workman I find it desirable to constitute the guides 65 who operates it, which is simple and econom- C C of piping or tubing' and to seat the ends ical in structure, and which is strong' and durof the same in suitable recesses c inthe yoke able in practical use and my invention con- C and the tripod-frame and to provide the `sists in the devices and parts and their comlong bolts C2, extending` longitudinally binations hereinafter described, and more through said tubes and held by nuts c2, as 7o 2o particularly recited in the claims. shown. Figure l is a front elevation of a rock-drill The tripod or standard D is constructed containing my invention. Fig. 2 is a plan of with arms or extensions on its frame or plath the same. Fig. 3 is a plan of the tripod deform, which reach beyond the front or fortached. Fig. al. is a plan of the upper head of ward side of the drill. and the guides O, as 75 the cylinder detached. Fig. 5 is a similar are shown at d (Z, and with an arm d', (one or view of the lower Vhead of the cylinder. Fig. more,) reaching to the rearward of the drill (3 is a plan of the chuck. Fig. 7 is a side eleand its guides, as shown. The frame D is vation of the same; and Fig. 8 is a vertical preferably in the form of a spider, as shown section of the same on the linerx fr, Fig. 7. in Fig. 3, the arms (Z (l extending forward and 8o 3o A is the drill-cylinder. somewhat to the side in opposite directions, A is the piston-rod which operates the drilland the rear arm d constituting a perforated tool and which carries the tool-holding chuck or skeleton platform, as shown, and the boltn E on its free end. holes for thebolts sustaining the guides C C A2 is the feed-screw. being i-n the standard at or about the junc- 85 The upper cylinder-head B is formed or tion of each arm d with said platform d. In provided with the lugs l), which are bored the extremities of the arms are the legs d2, through, as shown, and the lower cylinderwhich are preferably composed of rods havhead B is similarly formed or provided with ing a vertical portion d3, seated in an aperlugsl 1)',whieh are also bored through, and ture in the arm and adapted to slide verti- 4o said lugs are so located and arranged on the cally therein and to be held in adjustment respective heads and on the opposite edges of therein by means of set-screws d, and, fureach, as shown, that the apertures in the lugs thermore, of an outwardly-inclined portion (Z5 on the corresponding sides of the two heads below the standard, as shown. The arm or will correspond when the heads are bolted in skeleton platform d may be provided with a 95 place on the respective ends of the cylinder. supplemental plate or platform d, if desired. The heads are conveniently held tothe cylin- By means of the construction and combinader ends by the long bolts b2, passed through tion of parts shown and described I produce corresponding apertures l, in lugs on both a rock-drill in which the cylinder and its opheads, as shown. The feed-screw works in a erative parts are provided with alight-weight roo 5o threaded aperture b in the upper head B. frame for supporting the same, and upon O C are guides which pass through the corwhich the cylinder may be slid vertically in feeding the drill, and which, by means of the described platform or standard D, the workman operating the machine may hold the same steady during working by bearing his own weight upon the platform d or by placing one foot upon it the form of the standard; and when thus steadied, securing its firm and Iixed position on the ground or rock. The employlnent of large, heavy, and cumbersome weights upon the legs or base of the apparatus is thus ob'viated, and, while it is evident that the frame may, if desired, be readily taken apart, it is also evident that the structure as a whole may be readily and conveniently transported by the workman from place to place.

I have devised the form of chuck shown at E as specially adapted for use in connection with adrill mounted on the described guides and standard. The chuck is preferably formed upon and as part of the pistonrod, as shown. The wall ot the chuek-recess is slotted, as shown in Fig. S, and in this slot is fitted to work a key c, adapted to bear against the drill-tool, and having a head c', which iits in a groove ci in the head ci of a clampingbolt e, The shank of the bolte is at one side or edge of its said head c3, and the head is adapted in area to reach across the slotted side ot' the chuck and embrace thc key, while the shank passes through a lug ci', formed on the outside of the chuck, and beyond the same is furnished with a holding-nut e6.

By means of the described devices the drilltool may, obviously, be secured firmly in the chuck, and when it is desired to release the rods and giving bearing for said feedscrew,

together with the horizontal standard D, composed ot the radially and forwardly extended arms (l d and the rearwardly-extended frame d', the two said guide-rods being mounted vertically on said standard, so that the piston rod of the cylinder will reciprocate the drilltool between the forward arms thereof, and said arms and frame of said standard being provided with. supporting-legs d2, substantially as and for the purpose set forth.

2. In a rock-drill, the combination, with the piston-rod, of a chuck E, having the external side lug c5, the key e, working in a slot in the side wall of the chuck-body, together with a single clamping-bolt e4, adapted to be seated in said side lug, and having the hooked head c, engaging said key, together with the nut e, all constructed and arranged to operate as and for the purpose set forth.

JOSEPH C. GITIIENS.

'Witnesscsz A. S. FITCH, A. T. FALns. 

